In my lifetime, the role of women and girls in British society has been transformed. There has been an emancipation revolution.

Many of these changes have been legal. It seems remarkable today to reflect that, until 1975, women were not allowed to buy a house without financial guarantees being provided by a man, typically their father or husband.Other changes have been cultural. It is extraordinary, for example, that until 1972 a female diplomat in the Foreign Office was required to resign if she got married.

As each of these barriers to female attainment has been removed, women have capitalised on the opportunities …